It is hard to tell. There is no obvious issue with the model. My guess would be that it is really hard to find the correct mode. My only suggestion is to follow the iterative mode-finding suggested in:
[Usual Bayesian estimation problem)
It is hard to tell. There is no obvious issue with the model. My guess would be that it is really hard to find the correct mode. My only suggestion is to follow the iterative mode-finding suggested in:
[Usual Bayesian estimation problem)